John Glenn, the 1st American to orbit Earth, has died at 95

John Glenn, whose 1962 flight as the first U.S. astronaut to orbit the Earth made him an all-American hero and propelled him to a long career in the U.S. Senate, died Thursday. The last survivor of the original Mercury 7 ...

Disseminating the new kilogram—an international 'dry run'

When the kilogram, the world's basic unit of mass, gets a new definition in 2018, it will be based not on a physical artifact but a constant of nature. However, researchers will still need to "realize" the new definition, ...

FAA contemplating whether millions of drones will fill skies

So many people are registering drones and applying for drone pilot licenses that federal aviation officials said Friday they are contemplating the possibility of millions of unmanned aircraft crowding the nation's skies in ...

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